| //------------------------------------------------------------------------------ |
| // Copyright (c) 2008 IBM Corporation and others. |
| // All rights reserved. This program and the accompanying materials |
| // are made available under the terms of the Eclipse Public License v1.0 |
| // which accompanies this distribution, and is available at |
| // http://www.eclipse.org/legal/epl-v10.html |
| // |
| // Contributors: |
| // IBM Corporation - initial implementation |
| //------------------------------------------------------------------------------ |
| |
| package org.eclipse.epf.library.diagram.providers; |
| |
| import java.util.ArrayList; |
| |
| import org.eclipse.core.runtime.IConfigurationElement; |
| import org.eclipse.core.runtime.IExtension; |
| import org.eclipse.core.runtime.IExtensionPoint; |
| import org.eclipse.core.runtime.IExtensionRegistry; |
| import org.eclipse.core.runtime.Platform; |
| import org.eclipse.emf.ecore.EObject; |
| import org.eclipse.epf.library.LibraryPlugin; |
| import org.eclipse.epf.uma.MethodElement; |
| import org.eclipse.epf.uma.Role; |
| import org.eclipse.epf.uma.Task; |
| import org.eclipse.epf.uma.WorkProduct; |
| import org.eclipse.swt.graphics.Image; |
| |
| /** |
| * This class manages all of the icon providers, and handles querying them for |
| * icons based on the node provided. It will decode the node back to the |
| * MethodElement then use that to call the provider and retrieve the icon. |
| * |
| * |
| * @author Shilpa Toraskar |
| * @since 1.5 |
| * |
| */ |
| public class DiagramIconProviderManager { |
| /** |
| * The extension point namespace. |
| */ |
| public static final String EXTENSION_POINT_NAMESPACE = "org.eclipse.epf.diagram.core"; //$NON-NLS-1$ |
| |
| /** |
| * The extension point name. |
| */ |
| public static final String EXTENSION_POINT_NAME = "diagramIconProviders"; //$NON-NLS-1$ |
| |
| /** |
| * The "class" attribute name. |
| */ |
| public static final String CLASS_ATTRIB_NAME = "class"; //$NON-NLS-1$ |
| |
| /** |
| * Reference to myself for singleton instance |
| */ |
| private static DiagramIconProviderManager instance; |
| |
| /** |
| * The list of registered providers |
| */ |
| private ArrayList<IDiagramIconProvider> providers; |
| |
| /** |
| * Private constructor to avoid outside instantiation |
| */ |
| private DiagramIconProviderManager() { |
| // private to avoid outside calls |
| } |
| |
| /** |
| * This method returns the singleton instance of this class. |
| * |
| * @return ElementPropertyProviderManager |
| */ |
| public static DiagramIconProviderManager getInstance() { |
| if (instance == null) { |
| instance = new DiagramIconProviderManager(); |
| } |
| return instance; |
| } |
| |
| /** |
| * This method will attempt to return an Image based on a diagram element. |
| * This method is called from the diagram edit parts. If there are no |
| * providers, a null will be returned. |
| * |
| * |
| * @param element |
| * EObject |
| * @param smallIcon |
| * TODO |
| * @return Image |
| */ |
| public Image getIcon(EObject element, boolean smallIcon) { |
| Image image = null; |
| |
| if (providers == null) { |
| loadProviders(); |
| } |
| |
| if (element instanceof Role || element instanceof Task |
| || element instanceof WorkProduct) { |
| for (int index = 0; index < providers.size() && image == null; index++) { |
| IDiagramIconProvider iProvider = providers.get(index); |
| image = iProvider.getImageForElement((MethodElement) element, |
| false); |
| } |
| } |
| |
| return image; |
| } |
| |
| /** |
| * This method loads the icon providers from the extension point |
| */ |
| private void loadProviders() { |
| providers = new ArrayList<IDiagramIconProvider>(); |
| IExtensionRegistry extensionRegistry = Platform.getExtensionRegistry(); |
| IExtensionPoint extensionPoint = extensionRegistry.getExtensionPoint( |
| EXTENSION_POINT_NAMESPACE, EXTENSION_POINT_NAME); |
| if (extensionPoint != null) { |
| IExtension[] extensions = extensionPoint.getExtensions(); |
| for (int i = 0; i < extensions.length; i++) { |
| IExtension extension = extensions[i]; |
| IConfigurationElement[] configElements = extension |
| .getConfigurationElements(); |
| for (int j = 0; j < configElements.length; j++) { |
| IConfigurationElement configElement = configElements[j]; |
| try { |
| providers.add((IDiagramIconProvider) configElement |
| .createExecutableExtension(CLASS_ATTRIB_NAME)); |
| } catch (Exception e) { |
| LibraryPlugin.getDefault().getLogger().logError(e); |
| } |
| } |
| } |
| } |
| } |
| |
| } |